US 2017/0366355 A1 · PARITY CHECK MESSAGE AUTHENTICATION CODE

Abstract

The invention provides a method and system for authenticating a plaintext message at a sender computing device and verifying the integrity and authenticity of the plaintext message at a receiver computing device. Firstly, the method includes prepending a random string to the plaintext message and then generating a ciphertext corresponding to the plaintext message by encrypting the plaintext message prepended with the random string using an encryption algorithm. The method also includes the step of generating a compressed image of the plaintext message and generates an authentication tag from the compressed image of the plaintext message and the random string. Thereafter, the method transmits both the ciphertext and the authentication tag generated at the sender computing device to the receiver computing device. The receiver computing device, on receiving the ciphertext and the authentication tag corresponding to the plaintext message, verifies the integrity and authenticity of the plaintext message.

Claims19

Dependent claims

A computer-implemented method for authenticating a plaintext message, the method comprising:

prepending, by one or more processors, a random string to the plaintext message;
generating, by one or more processors, a ciphertext corresponding to the plaintext message, wherein the plaintext message prepended with the random string is encrypted, by one or more processors, using an encryption algorithm to generate the ciphertext;
generating, by one or more processors, a compressed image of the plaintext message;
generating, by one or more processors, an authentication tag, wherein the authentication tag is generated from the compressed image of the plaintext message and the random string;
enabling, by one or more processors, a sender computing device to transmit the ciphertext and the authentication tag to a receiver computing device;
and
enabling, by one or more processors, the receiver computing device to verify an integrity and authenticity of the plaintext message using the ciphertext and the authentication tag corresponding to the plaintext message.

4 more elements

A system for authenticating a plaintext message, the system comprising:

a memory;
a processor communicatively coupled to the memory, wherein the processor is configured to:
prepend a random string to the plaintext message;
generate a ciphertext corresponding to the plaintext message, wherein the plaintext message prepended with the random string is encrypted using an encryption algorithm to generate the ciphertext;
generate a compressed image of the plaintext message;
generate an authentication tag, wherein the authentication tag is generated from the compressed image of the plaintext message and the random string;
enable a sender computing device to transmit the ciphertext and the authentication tag to a receiver computing device;
and
enable the receiver computing device to verify an integrity and authenticity of the plaintext message using the ciphertext and the authentication tag corresponding to the plaintext message.

6 more elements

A computer program product for authenticating a plaintext message, the computer program product comprising a non-transitory computer readable storage medium having program instructions stored therein, the program instructions readable/executable by a processor to cause the processor to:

prepend a random string to the plaintext message;
generate a ciphertext corresponding to the plaintext message, wherein the plaintext message prepended with the random string is encrypted using an encryption algorithm to generate the ciphertext;
generate a compressed image of the plaintext message;
generate an authentication tag, wherein the authentication tag is generated from the compressed image of the plaintext message and the random string;
enable a sender computing device to transmit the ciphertext and the authentication tag to a receiver computing device;
and
enable the receiver computing device to verify an integrity and authenticity of the plaintext message using the ciphertext and the authentication tag corresponding to the plaintext message.

4 more elements

Dependencies are inferred from the claim text.

Parity check message authentication code

Life of this patent

Parity check message authentication code

Life of this patent

Abstract

Claims19